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29 July 2024, 15:18:00 UTC
Revision 3f2ab135946dcd4eb6af92a53d6d4bd35e7526ca authored by Daniel Borkmann on 22 January 2015, 09:41:02 UTC, committed by David S. Miller on 26 January 2015, 23:50:19 UTC 
net: cls_bpf: fix auto generation of per list handles
 
When creating a bpf classifier in tc with priority collisions and
invoking automatic unique handle assignment, cls_bpf_grab_new_handle()
will return a wrong handle id which in fact is non-unique. Usually
altering of specific filters is being addressed over major id, but
in case of collisions we result in a filter chain, where handle ids
address individual cls_bpf_progs inside the classifier.

Issue is, in cls_bpf_grab_new_handle() we probe for head->hgen handle
in cls_bpf_get() and in case we found a free handle, we're supposed
to use exactly head->hgen. In case of insufficient numbers of handles,
we bail out later as handle id 0 is not allowed.

Fixes: 7d1d65cb84e1 ("net: sched: cls_bpf: add BPF-based classifier")
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent 7913ecf
History
Tip revision: 3f2ab135946dcd4eb6af92a53d6d4bd35e7526ca authored by Daniel Borkmann on 22 January 2015, 09:41:02 UTC
net: cls_bpf: fix auto generation of per list handles
Tip revision: 3f2ab13
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